Kojima Hirokazu, Takahashi Eiichi, Furutani Hirohide
Opt Express. 2014 Jan 13;22 Suppl 1:A90-8. doi: 10.1364/OE.22.000A90.
The breakdown plasma and successive flow leading to combustion are controlled by the combination of a nano-second Nd:YAG laser and a femto-second Ti:Sapphire (TiS) laser. The behaviors are captured by an intensified charged coupled device (ICCD) camera and a high-speed schlieren optical system. The TiS laser determines the initial position of the breakdown by supplying the initial electrons in the optical axis of focusing YAG laser pulses. We show that the initial position of the breakdown can be controlled by the incident position of the TiS laser. In addition, the ignition lean limit of the flammable mixture changes depending on the TiS laser incident position, which is influenced by hot gas distribution and the flow in the flame kernel.
由纳秒级钕钇铝石榴石（Nd:YAG）激光器和飞秒级钛宝石（Ti:Sapphire，TiS）激光器组合控制导致燃烧的击穿等离子体及其后续流动。这些行为由增强型电荷耦合器件（ICCD）相机和高速纹影光学系统捕获。TiS激光器通过在聚焦YAG激光脉冲的光轴上提供初始电子来确定击穿的初始位置。我们表明，击穿的初始位置可通过TiS激光器的入射位置来控制。此外，可燃混合物的点火贫燃极限会根据TiS激光器的入射位置而变化，这受到热气体分布和火焰核内流动的影响。
